Reddening of urine generally refers to blood in the urine. Women with urinary tract infections may have blood in the urine, which is related to the degree of infection. Mild urinary tract infection may manifest as a mild inflammatory reaction of the urethral mucosa, which may cause a small amount of bleeding and an increase in the number of red blood cells in the urine, but the urine is usually not red when observed with the naked eye. When the infection is further aggravated and manifests itself as diffuse inflammation of the urinary tract mucosa, it can cause extensive bleeding, which can lead to hematuria with the naked eye. In this case, the degree of infection is more serious, and accompanied by obvious symptoms of urinary tract irritation. In addition, red urine can also be caused by drugs, such as oral rifampicin capsules, which can cause red urine. It is also possible that urethral stones cause damage to the urethral mucosa and hematuria. Female urinary infections appear urine redness, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment.